In order to understand the significance of latkes on Hanukah, one must relax one's imagination a bit. (Same for understanding sufganiot). Latkes and sufganiot are cooked in oil. Back in 'the day', the lamp oil left after the destruction of the temple was only supposed to last 1 night, but it lasted 8! (long enough for more oil to be made) It's a miracle! Let's all clog our pores and arteries!
There's a lot more to the story, but that's the important bit.
HTH,
Hillary
PS - sufganiot are jelly doughnuts